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If you are using a 12 volt 12 ah battery it is more than enough to power your FF. as long as the battery is good. Have you tried putting a volt meter on the battery after charging. It should be closer to 13v after a full charge, and maintain that voltage for a while. You may also want to look into your charger. Third thing would be transducer. If not mounted properly, it could read that plate underneath it. Did you leave enough gap between the plate and transducer so that water can pas in between the two? How about cabling? Did you use all the right size and fuse it properly? Connections tight on everything? After all of those tests and everything checks out, I would try to return the transducer for another one. Did they give you another transducer when you did an exchange?
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